1.

If Dk=∣∣∣∣∣1nn2kn2+n+1n2+n2k−1n2n2+n+1∣∣∣∣∣ andn∑k=1Dk=56, then n is

Answer» If Dk=

1nn2kn2+n+1n2+n2k1n2n2+n+1

andnk=1Dk=56, then n is


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